I assume the injectors where cleaned at U/T ?
I'd say reving it to try and clear cylinder may have made it worse...
Pluss they have a cheek to hand your car over as they would have known it was running crap..Or did they ??...They are supposed to be qualified tradesmen..I wouldn't pay too much...Did they fit new injector or clean the one suspect??
It was their wrong diagnosis not your wrong desicion to take it there...
WHY was valve not shutting properly ???
Bent valve or broken valve spring is the usual fault....
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